OGRE  2.0
Object-Oriented Graphics Rendering Engine
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Ogre::StaticFaceGroup Struct Reference

Collects a group of static i.e. More...

#include <OgreStaticFaceGroup.h>

+ Collaboration diagram for Ogre::StaticFaceGroup:

Public Attributes

int elementStart
 Index into a buffer containing vertex indices. More...
 
FaceGroupType fType
 
bool isSky
 Is this a sky surface? More...
 
ResourceHandle materialHandle
 Handle to material used by this group. More...
 
int numElements
 The number of vertex indices. More...
 
int numVertices
 The range of vertices in the buffer this facegroup references. More...
 
PatchSurfacepatchSurf
 Patch surface (only applicable when fType = FGT_PATCH) More...
 
Plane plane
 
int vertexStart
 Index into a buffer containing vertex definitions. More...
 

Friends

_OgreExport friend std::ostream & operator<< (std::ostream &o, const StaticFaceGroup &s)
 

Detailed Description

Collects a group of static i.e.

immovable faces together which have common properties like the material they use, the plane they lie on.

Remarks
Whilst for discrete geometry (i.e. movable objects) groups of faces are held in the SubMesh class, for immovable objects like scenery there needs to ba little more flexibility in the grouping since the group is likely to be a small part of a huge set of geometry. In addition, because the faces are unmoving certain optimisations can be performed, e.g. precalculating a world-coordinate bounding box and normal.
Exactly how this class is used depends on the format of the large static geometry used in the level. An example would be the use of this class in the BspNode class for indoor levels. For flexibility and efficiency, it is not assumed that this class holds details of the vertices itself, or in fact that it holds the vertex indices itself. Everything is manipulated via pointers so if you want this class to point into a block of geometry data it can.

Definition at line 69 of file OgreStaticFaceGroup.h.

Friends And Related Function Documentation

_OgreExport friend std::ostream& operator<< ( std::ostream &  o,
const StaticFaceGroup s 
)
friend

Definition at line 113 of file OgreStaticFaceGroup.h.

Member Data Documentation

int Ogre::StaticFaceGroup::elementStart

Index into a buffer containing vertex indices.

This buffer may be individual to this group or shared for memory allocation efficiency.The vertex indexes are relative the the mVertexStart pointer, not to the start of the large-level buffer, allowing simple reindexing when copying data into rendering buffers. This is only applicable to FGT_FACE_LIST face group types.

Definition at line 94 of file OgreStaticFaceGroup.h.

FaceGroupType Ogre::StaticFaceGroup::fType

Definition at line 71 of file OgreStaticFaceGroup.h.

bool Ogre::StaticFaceGroup::isSky

Is this a sky surface?

Definition at line 74 of file OgreStaticFaceGroup.h.

ResourceHandle Ogre::StaticFaceGroup::materialHandle

Handle to material used by this group.

Note the use of the material handle rather than the material name - this is for efficiency since there will be many of these.

Definition at line 105 of file OgreStaticFaceGroup.h.

int Ogre::StaticFaceGroup::numElements

The number of vertex indices.

This is only applicable to FGT_FACE_LIST face group types.

Definition at line 99 of file OgreStaticFaceGroup.h.

int Ogre::StaticFaceGroup::numVertices

The range of vertices in the buffer this facegroup references.

This is really for copying purposes only, so that we know which subset of vertices to copy from our large-level buffer into the rendering buffer.

Definition at line 85 of file OgreStaticFaceGroup.h.

PatchSurface* Ogre::StaticFaceGroup::patchSurf

Patch surface (only applicable when fType = FGT_PATCH)

Definition at line 110 of file OgreStaticFaceGroup.h.

Plane Ogre::StaticFaceGroup::plane

Definition at line 107 of file OgreStaticFaceGroup.h.

int Ogre::StaticFaceGroup::vertexStart

Index into a buffer containing vertex definitions.

Because we're dealing with subsets of large levels this is likely to be part-way through a huge vertex buffer.

Definition at line 79 of file OgreStaticFaceGroup.h.


The documentation for this struct was generated from the following file: